Re: [PATCH v5 00/11] mtd: add datasheet's ECC information tonand_chip{}

From: Artem Bityutskiy
Date: Wed May 15 2013 - 06:03:41 EST


On Wed, 2013-05-15 at 16:40 +0800, Huang Shijie wrote:
> 1.) Why add the ECC information to the nand_chip{} ?
> Each nand chip has its requirement for the ECC correctability, such as
> "4bit ECC for each 512Byte" or "40bit ECC for each 1024Byte".
> This ECC info is very important to the nand controller, such as gpmi.
>
> Take the Micron MT29F64G08CBABA for example, its geometry is
> 8k page size, 744 bytes oob size and it requires 40bit ECC per 1K bytes.
> If we do not provide the ECC info to the gpmi nand driver, it has to
> calculate the ECC correctability itself. The gpmi driver will gets the 56bit
> ECC for per 1K bytes which is beyond its BCH's 40bit ecc capibility.
> The gpmi will quits in this case. But in actually, the gpmi can supports
> this nand chip if it can get the right ECC info.

Thanks. Brian has disappeared, may be busy, but I would still like to
wait for his response. At the very least, I would like to make sure he
does not object.

--
Best Regards,
Artem Bityutskiy

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